论文标题
授权THZ授权的RIS辅助非事物网络的安全传输
Secure Transmission for THz-Empowered RIS-Assisted Non-Terrestrial Networks
论文作者
论文摘要
非事故网络（NTN）被认为是在未来的无线通信中提供具有成本效益和高容量无处不在的连接性的关键组成部分。在本文中，我们调查了Terahertz（THZ）中的安全传输，可重新配置的智能表面（RIS）辅助NTN（T-RANTN），该ntn（t-rantn）由低地球轨道卫星发射机组成，由RIS式卫星发射机，RIS启用的高空平台（HAP）和两个未经管理的空气式（uav）的接收器（仅是Iss in Is sovers），仅是一个Iss ins in Is sovers，仅是一项是一项。当大气湍流和由于THZ的特征以及由RIS的有限精度和不完善的通道估计引起的相误差引起的大气湍流和指向误差时，得出了近似值的保密率（ESR）表达。此外，根据不信任的接收器的统计和完美的通道状态信息，我们通过使用半决赛弛豫方法优化了RIS的相移，以最大程度地提高保密率（SR）和瞬时SR的下限。仿真结果表明，ESR的近似表达和优化算法都是可以使用的，即使值得信赖的接收器的抖动标准差异大于不信任的接收器，仍然可以保证正SR。
The non-terrestrial networks (NTNs) are recognized as a key component to provide cost-effective and high-capacity ubiquitous connectivity in the future wireless communications. In this paper, we investigate the secure transmission in a terahertz (THz)-empowered reconfigurable intelligent surface (RIS)-assisted NTN (T-RANTN), which is composed of a low-Earth orbit satellite transmitter, an RIS-installed high-altitude platform (HAP) and two unmanned aerial vehicle (UAV) receivers, only one of which is trustworthy. An approximate ergodic secrecy rate (ESR) expression is derived when the atmosphere turbulence and pointing error due to the characteristics of THz as well as the phase errors resulting from finite precision of RIS and imperfect channel estimation are taken into account simultaneously. Furthermore, according to the statistical and perfect channel state information of the untrustworthy receiver, we optimize the phase shifts of RIS to maximize the lower bound of secrecy rate (SR) and instantaneous SR, respectively, by using semidefinite relaxation method. Simulation results show that both the approximate expression for the ESR and the optimization algorithms are serviceable, and even when the jitter standard variance of the trustworthy receiver is greater than that of the untrustworthy one, a positive SR can still be guaranteed.
